JPH082882Y2 - Projector type vehicle headlight - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a projector type vehicle headlight,
In particular, the present invention relates to a projector type automobile headlamp improved so that a traveling light distribution pattern (high beam state) and a passing light distribution pattern (low beam state) can be switched.

[Conventional technology]

Automotive headlights brightly illuminate the front of your lane,
Moreover, it must have a light distribution pattern that does not dazzle oncoming vehicles.

As a headlight having a light distribution characteristic meeting the above requirements, a simple lens configuration, and a small overall shape, a projector type automotive headlight has been proposed. For example, Japanese Patent Application Laid-Open No. 58-209801 discloses the latest technology relating to this projector headlight.

FIG. 6 shows the above-mentioned known projector type headlight. The headlight of this known example is provided with a shell type reflector,
The axial section of the inner reflecting surface of this reflector forms a part of an ellipse, and the eccentricity of the ellipse increases from the axial vertical longitudinal section to the axial horizontal longitudinal section. In the lamp, the focal points 105 of the elliptical portions 101, 102 of all the axial cross sections and the corresponding vertices 104 of the elliptical portions 101, 102 of all the axial cross sections are arranged to coincide.

110 is the outer focal point of the ellipse 102, 110 is a dimmer in the form of a shading plate, 1
Reference numeral 12 is an outer focus of the ellipse 101, and 113 is a lens.

FIG. 7 is a plan view schematically showing an example of this type of projector headlight, FIG. 8 is a side view of the same, and FIG. 9 is a front view of the same.

Reference numeral 1 is a concave mirror, and F is its focal point. The light source bulb 2 is provided so that the filament is located near the focal point F.

An optical axis Z is shared with the concave mirror 1 and a convex lens 3
Is provided.

Ij shown in FIG. 7 indicates the meridional image plane of the convex lens 3, and the light emitted from the light source and reflected by the concave mirror 1 is incident on this meridional image plane.

The incident light is dimmed by the convex lens 3 and projected forward (rightward in FIGS. 7 and 8).

By providing a screen near the meridional image plane,
Fig. 10 shows the light distribution pattern as an isolux curve. H-H is a horizontal line on the screen, and V-V is a vertical line.

As shown in FIGS. 7 to 9, a shade 4 having an edge along the meridional image plane is provided. Specifically, as shown by 4a in FIG. 9, a horizontal section i-j of the meridional image plane is shown.
A cutting line 4a is formed so as to recede downward from the.
FIG. 10 shows how the above-mentioned light distribution pattern and the shade 4 overlap. As shown in Figure 10,
The upper half of the light flux passes through. Most of the lower half is blocked,
Light is allowed to pass through the portion corresponding to the cutting line 4a.

Since the light beams partially covered as described above are condensed on the meridional image plane i-j and intersect each other, the light beam projected in front of the headlamp has a pattern of an inverted shape of FIG. To form. FIG. 11 is an explanatory view showing a schematic shape of a projection pattern by an isolux curve on a screen provided in front of the headlight.

This conventional example is configured for left-hand traffic, and in the case of right-hand traffic, FIGS.

Assuming the case of traveling on a straight two-lane road while illuminating the front of the road with a headlight having a light distribution pattern as shown in FIG. 11, the V-V line in this figure is the center line of the road. Become parallel. Therefore, the vehicle traveling in the oncoming lane is located on the right side of the V-V line, and is not dazzled by the headlight of the vehicle on the other side.

However, when traveling on a curve with a left turn, the center line of the road appears to be curved to the left like a virtual line L. Therefore, an oncoming vehicle traveling along the center line L as indicated by the arrow l enters the area illuminated by the headlights of our vehicle and is dazzled.

Further, in the case of a clockwise curve, the far side of the center line is curved to the right as indicated by the imaginary line R, so that the vicinity where the vehicle is going to travel along this is not illuminated as indicated by the arrow r.

In order to solve such a problem, it may be possible to support the headlight so that the headlight can be rotated right and left with respect to the vehicle body, but there is a drawback in that the device is complicated, large and heavy, and expensive.

In view of the above circumstances, the shade is horizontally moved so that the illuminated area can be freely operated in the left and right directions.
Besides, while providing means for guiding in the direction perpendicular to the optical axis,
A projector type headlight having means for reciprocally driving the shade in the above-mentioned direction has been proposed (Shokaisho 63-165703).
This invention is a patent application filed separately by the present applicant (hereinafter referred to as prior application).

As described with reference to FIGS. 10 and 11, the light distribution pattern of the illumination luminous flux is restricted above the line H-H in FIG. 11, that is, the shadow of the shade is projected. . Therefore, when the shade is moved to the left or right according to the configuration of the prior application, the cutting line on the projected light beam distribution pattern moves to the left or right, and the illuminated area expands to the left or contracts to the right.

FIG. 12 shows an embodiment of a projector headlight according to the invention of the prior application, (A) is a plan view and (B) is a side view. In this figure, those denoted by the same drawing reference numerals as in FIGS. 7 and 8 are the same or similar constituent members as in the prior art example.

Reference numeral 5 is a shade formed by applying the invention of the prior application, and by the shade guide 6, it is moved in the horizontal direction (vertical direction in FIG. 12 (A), depth direction in the drawing in FIG. 12 (A)) perpendicular to the optical axis. , Is slidably supported.

The rack gear 7 is fixed to the shade 6 and the pinion gear 8 is meshed with the rack gear 7.
9 is a motor for driving a pinion gear.

In this example, when the motor 9 is normally or reversely rotated, the shade 5 moves to the left and right in the irradiation direction (arrow Z).

FIG. 13 shows a light distribution pattern in this example, which is V-V
The line, H-H line and isolux curve are almost the same as in the conventional example (Fig. 13).

The cut line Cs on the light distribution pattern shown in FIG.
It shows the case where the shade 5 is positioned at the center (state of FIG. 12 (A)).

When the shade 5 is moved to the right in the irradiation direction (arrow Z),
The cut line in Fig. 13 is an inverted image of Cr
As shown in the figure, the light distribution is such that it moves to the left and does not dazzle the oncoming vehicle in the counterclockwise curve.

Further, when the shade 5 is moved to the left in the irradiation direction, the cutting line in FIG. 13 moves to the right like Cl, and the front of the traveling path of the own vehicle enters the illumination area in the clockwise curve.

[Problems to be solved by the device]

According to the projector headlight according to the invention of the prior application, the cutting line can be arbitrarily operated like Cr to Cl (see FIG. 13) to adapt to the road surface condition, and when there is no oncoming vehicle. Move the cutting line to the Cl 'position,
It is also possible to illuminate each of 30 ° to the left and right, and to move the cutting line to the Cr 'position so that the horizontal line H-H is not illuminated.

In the invention of the prior application, the cut line can be moved left and right according to the state of the road surface on which the vehicle travels. For example, when the cut line is moved to the position of Ce (Fig. 13), a traveling light distribution pattern (so-called high beam) is obtained.

However, by simply moving the cut line left and right in this way, it is not possible to ideally switch between high beam and low beam, and the problem of moving the hot zone must be solved.

For example, in FIG. 13, a zone (hot zone) having a maximum illuminance of 100 lux is located at the intersection of the H line and the V line.

Therefore, when the cut line is set to the Cs position to be in the low beam state, a part of the hot zone is cut, which deteriorates the effective utilization rate of the light flux.

In the case of a low beam, it is desirable that the hot zone (maximum illuminance zone) be located slightly below the H line.

Further, in the traveling beam (high beam), it is desirable that the hot zone is located near the intersection of the H line and the V line or slightly above.

The present invention has been made in view of the above circumstances. A. There is a low beam state in which there is a cut line and the hot zone is located below the H line, and b. There is no cut line and the hot zone is in the H line. A high beam state near or above the H line,
A project that can be switched to any of the
It is intended to provide a headlight for a T-type vehicle.

[Means for solving the problem]

The basic principle of the present invention created to achieve the above-mentioned object is outlined as follows.

I. A prism lens that slightly deflects the horizontal parallel light flux emitted from the light source bulb, reflected by the reflecting mirror, and condensed by the convex lens toward the downward lane and / or the side of the driving lane, and places this prism lens in front of the convex lens Deploy.

B. To obtain a high beam, the prism lens and the shade are retracted.

C. To obtain a low beam, the prism lens and the shade are advanced to a predetermined position.

Various guide mechanisms and drive means for advancing and retracting the prism lens and the shade are conceivable, but in consideration of the positional relationship when the projector headlight is mounted on the automobile, these members (the shade and It is convenient to divide the prism lenses) into left and right parts at the central part and retract them to the left and right parts.

Furthermore, in addition to moving in parallel to the left and right, it swivels 90 degrees around the vertical axis to keep it in a posture almost perpendicular to the optical axis when in use and parallel to the optical axis in the retracted state. It would be very convenient if it could be stored to the side of the light.

As a concrete structure based on the above-mentioned principle, the projector headlight according to the present invention has a light source bulb installed near the first focal point of the reflecting mirror, and the light emitted from the light source bulb is reflected by the reflecting mirror. In a projector-type headlight that is formed into a second focal point in the vicinity of a shade having a cutting line and projects the reflected light forward by a convex lens, the shade is divided into left and right, and a prism is provided in front of the convex lens. A lens is arranged and the prism lens is divided into two parts, left and right, and each of the two divided shades is attached to each of a pair of gears rotatably supported by a vertical shaft. , Each of the two divided prism lenses is attached to each of a pair of gears rotatably supported by a vertical axis. And a gear attached to the attached gear and a prism lens Shiedo, characterized in that via the drive gear is provided with a motor for driving rotation.

[Action]

According to the above configuration, the two-divided shade and the two-divided prism lens move forward and backward while interlocking with each other.

Here, the forward movement means that the two divided members approach each other from the optical axis, and the retreat means that they are separated from each other.

When the divided two shades and the prism lens approach each other to the optical axis, the shade blocks a part of the projected light beam to form a cut line, and the prism lens moves the projected light beam downward (and / or in the self-running lane). This causes a low beam to be formed.

Further, if the shade and the prism lens are retracted away from the optical axis, part of the projected light flux is not blocked, and the prism lens does not deviate the projected light flux to form a high beam.

In this way, by driving the two-divided shade and the two-divided prism lens to move forward and backward, the light distribution pattern of the projector headlight can be changed to low beam or high beam, and switching operation can be performed quickly and easily. You can

〔Example〕

FIG. 1 is a bottom view showing an embodiment of a projector headlight according to the present invention, and FIG. 1 (B) is a side view of the same.

Reference numeral 1 is a concave mirror, and 3 is a convex lens. The light source bulb is hidden by the concave mirror 1 and is not shown in the figure.

Z is an optical axis, which is a horizontal axis when the projector headlight is in use.

 X is a horizontal axis perpendicular to the Z axis and Y is a vertical axis.

11 is a shade. As shown in FIG. 1 (A), the shade 11 of this example is divided into left and right parts, and is composed of a half shield (right) 11r and a half shade 11l.

In the present invention, the right and left of the names of the constituent members are named according to the right and left when viewed from the person facing the light projecting direction.

On the other hand, the prism lens 14 is configured and is arranged in front of the convex lens 3 and perpendicular to the optical axis Z.

This prism lens 14 is also divided into left and right parts, and is composed of a half prism lens (right) 14r and a half prism lens (left) 14l.

The vertical axis Y is provided with four spur gears 15a, 15b, 15c, 15d which are rotatably supported around parallel gear shafts, and the spur gears 15a, 15b, 15c, 15c, 15d are sequentially meshed in this order. Let

 Spur gear 15a has a half-shade (right) 11r, spur gear 15b has a half-shade (left) 11l, spur gear 15c has a half-prism lens (left) 14l, and spur gear 15d has a half-prism lens (right). ) 14r are fixed respectively.

The drive gear 16 attached to the motor 18 is replaced by the spur gear 15
Engage with b.

When the drive gear is rotated counterclockwise as indicated by the circular arc arrow, each gear 15a to 15d is rotated as shown in FIG. Along with this, the pair of half-split shades 11l and 11r and the pair of half-split prism lenses 14l and 11r are opened left and right apart.

With the above operation, a pair of half-shields 11l, 11r,
And the pair of half prism lenses 14l and 14r rotate about the vertical axis, respectively, become substantially parallel to the optical axis Z while maintaining the vertical posture, and retract to the left and right sides of the projector headlight. , It does not get in the way and does not significantly increase the installation space occupied by the entire lamp.

As shown in Fig. 2, a pair of half-shades 11l, 11r
FIG. 4 shows a light distribution pattern when the pair of half prisms 14l and 14r are opened as well as the light is reflected from the optical path of the light beam reflected by the concave mirror 1.

This FIG. 4 is a diagram showing an isolux curve when the optical axis Z of the projector headlamp of this embodiment is installed with its optical axis Z substantially horizontal and a vertical screen provided about 10 meters forward is illuminated. is there.

H-H is a horizontal line intersecting the optical axis Z, and V-V is a vertical line. The numbers attached to the bottom and left and right sides of the chart are angles (units are degrees).

The hot zone (300lux zone in this example) is
It is located in the center in the left-right direction.

The hot zone is located approximately in the center in the vertical direction (specifically, about 0.5 degrees downward).

Since the shades 11l and 11r are retracted from the optical path, the cut line does not appear in the light distribution pattern chart (Fig. 4), and the light distribution characteristic suitable as a high beam is shown.

As shown in Fig. 1 (A), a pair of half-shields 11l,
When 11r is closed and it is in a vertical posture with respect to the optical axis Z and advances to the optical path, a pair of half prism lenses 14l,
When 14r is closed and enters the optical path in a posture perpendicular to the optical axis Z, the light distribution pattern (isolux curve chart on the screen) changes as shown in FIG.

Comparing this FIG. 5 (shade, prism lens advance) with FIG. 4 (shade, prism lens retreat) described above, i. Cut line is shown.

That is, the oncoming lane side (right half in this example) is H-H
The upper side of the line is cut, and the upper side of the H-H line is restricted to be lower than the cut line Cf on the traveling lane side (the left half in this example). This is because a part of the light flux is blocked by the shade 11.

ii. The hot zone (minimum iso-illuminance curve) is moved to the driving lane side (left side in the figure) and to a position 1.5 degrees below the H-H line. This is because the light projection direction is biased to the lower left by the prism lens 14.

iii. In addition, the outer periphery of the alignment pattern (5lux in this example)
The outline of the zone) has expanded to about 9 degrees below. This is also due to the action of the prism lens 14.

According to this light distribution pattern (FIG. 5), there is no risk of dazzling oncoming vehicles, and it is suitable as a low beam.

As described above, in the present embodiment, one projector headlamp can be remotely operated by the motor 18 to switch between the high beam and the low beam.

In the prior art, if a switching between a traveling light distribution pattern (high beam) and a passing light distribution pattern (low beam) is performed using a projector type automotive headlamp, a projector type headlamp 2 provided with a shade is used. It had to be configured as a so-called four-lamp system using two individual projectors and two projector-type headlights without a shade. However, if the projector headlight for a vehicle of this example having the switching function between the high beam and the low beam as described above is applied, a two-lamp type configuration becomes possible.

FIG. 3 shows an embodiment different from the above, in which (A) is a bottom view of a low beam state, (B) is a side view of the same, and (C) is a bottom view of a high beam state.

A pair of worm receiving gears 19a, 19b rotatably supported by a gear shaft parallel to the vertical axis Y and a pair of worm receiving gears 19c, 19d are provided, and the worm receiving gears 19a, 19b are respectively provided with half halves. Split shade 1
1r and 11l are attached and meshed with the worm original gear 20a.

Half-prism lenses 14l and 14r are attached to the worm receiving gears 19c and 19d, respectively, and meshed with the worm original gear 20b.

The worm original gears 20a and 20b are connected to one shaft and attached to the rotary shaft of the motor 18.

Also in this embodiment, as in the above embodiment, a pair of half-splits 11r and 11l and a pair of half-splitting prism lenses 14 are provided.
The l and 14r are opened and closed by a worm original gear, which is a drive gear attached to the motor 18, and are rotated by the preceding example (see FIGS. 1 and 2).
It is possible to switch between the low beam and the high beam as in the case of FIG.

[Effect of device]

As described above, when the projector headlight for a vehicle according to the present invention is applied, it has a. Cut line and the hot zone is H-
A low beam that is biased to the lower side of the H line or to the driving lane side, and a low beam that has no cut line and has a hot zone located near the intersection of the H-H line and the V-V line by remote control. You can switch to.

As one of the results, it is possible to configure a two-lamp type headlight device that can perform a switching operation between a high beam and a low beam from the driver's seat with a projector type headlight.

[Brief description of drawings]

1 and 2 show an embodiment of the projector headlamp for a vehicle according to the present invention. FIG. 1 (A) is a bottom view in a low beam state, and FIG. 1 (B).
Is a side view in a low beam state, and FIG. 2 is a bottom view in a high beam state. 3 (A), (B) and (C) are explanatory views of an embodiment different from the above. FIG. 4 is a light distribution pattern chart in the high beam state, and FIG. 5 is a light distribution pattern chart in the low beam state. FIG. 6 is an explanatory view of a known projector type headlight. 7 to 9 show a conventional projector type headlight, FIG. 7 is a plan view, FIG. 8 is a side view, and FIG. 9 is a front view. 10 and 11 are charts showing the optical characteristics of the above conventional example. 12 (A), (B) and FIG. 13 are explanatory views of the invention of the prior application. 1 ... concave mirror, 2 ... light source bulb, 3 ... convex lens, 4
…… Shade, 4a …… Cut line, 5 …… Shade,
11 …… Shade, 11l, 11r …… Half-shade, 12a, 12b…
… Lever, 13 …… Vertical axis, 14 …… Prism lens, 14l,
14r …… Half-division prism lens, 15a to 15d …… Spur gear, 16
...... Drive gear, 18 ...... motor, 19a to 19d ...... Worm receiving gear, 20a, 20b ...... Worm original gear.

Claims (1)

[Scope of utility model registration request] 1. A light source bulb is installed in the vicinity of a first focal point of a reflecting mirror, and light emitted from the light source bulb is reflected by the reflecting mirror to form a second focal point in the vicinity of a shade having a cut line, and is reflected by a convex lens. In a projector-type headlight that projects light forward, the shade is divided into two parts on the left and right, and a prism lens is arranged in front of the convex lens, and the prism lens is divided into two parts on the left and right, Each of the two divided shades is attached to each of a pair of gears rotatably supported by a vertical axis, and each of the two divided prism lenses is rotatable by a vertical axis. Mounted on each of a pair of gears supported by the above, and attached with the above-mentioned shaded gears and prism lens And cars, characterized in that it comprises a motor for rotating through the driving gear, projector-type automotive headlamp.